| Download | - View final version: First light and reionisation epoch simulations (FLARES). IV. The size evolution of galaxies at z ≥ 5 (PDF, 3.3 MiB)
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| DOI | Resolve DOI: https://doi.org/10.1093/mnras/stac1368 |
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| Author | Search for: Roper, William J.ORCID identifier: https://orcid.org/0000-0002-3257-8806; Search for: Lovell, Christopher C.ORCID identifier: https://orcid.org/0000-0001-7964-5933; Search for: Vijayan, Aswin P.ORCID identifier: https://orcid.org/0000-0002-1905-4194; Search for: Marshall, Madeline A.1; Search for: Irodotou, DimitriosORCID identifier: https://orcid.org/0000-0003-2946-8080; Search for: Kuusisto, Jussi K.; Search for: Thomas, Peter A.ORCID identifier: https://orcid.org/0000-0001-6888-6483; Search for: Wilkins, Stephen M.ORCID identifier: https://orcid.org/0000-0003-3903-6935 |
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| Affiliation | - National Research Council of Canada. Herzberg Astronomy and Astrophysics
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| Funder | Search for: BEIS; Search for: STFC; Search for: Durham University |
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| Format | Text, Article |
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| Subject | galaxies: evolution; galaxies: high-redshift; galaxies: photometry |
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| Abstract | We present the intrinsic and observed sizes of galaxies at z ≥ 5 in the First Light And Reionisation Epoch Simulations (FLARES). We employ the large effective volume of FLARES to produce a sizeable sample of high-redshift galaxies with intrinsic and observed luminosities and half-light radii in a range of rest-frame ultraviolet (UV) and visual photometric bands. This sample contains a significant number of intrinsically ultracompact galaxies in the far-UV (1500 Å), leading to a negative intrinsic far-UV size–luminosity relation. However, after the inclusion of the effects of dust these same compact galaxies exhibit observed sizes that are as much as 50 times larger than those measured from the intrinsic emission, and broadly agree with a range of observational samples. This increase in size is driven by the concentration of dust in the core of galaxies, heavily attenuating the intrinsically brightest regions. At fixed luminosity we find a galaxy size redshift evolution with a slope of m = 1.21–1.87 depending on the luminosity sample in question, and we demonstrate the wavelength dependence of the size–luminosity relation that will soon be probed by the James Webb Space Telescope. |
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| Publication date | 2022-05-19 |
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| Publisher | Oxford Academic |
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| Licence | |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | e9dcc5d6-3295-4b56-b925-dc5bf883656c |
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| Record created | 2023-12-04 |
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| Record modified | 2023-12-04 |
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